I leave mine on full auto all the time and it works flawlessly. I simply switch the system on or off. The system will auto select fresh or recycled air depending on the temp of the air in the cabin verses the temp of the air outside. If you set it for say 22 it will self determine the most effective way to bring the temp down, every occasion will be different, if its 35 outside it might recycle the inside air until the inside air temp stabilizes at 22 but if you than turn it down to 20 it might than switch back to recycled again for 2 or 3 minutes until the temp stabilizes again at the new setting. The default is fresh (as it should be) but it will select recycled if it determines that that is the quickest way to bring the inside temp down.
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